package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;
import utils.Page;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;


//  注解：提供便捷的开发方式
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        // 1请求编码设置
        req.setCharacterEncoding("UTF-8");
        String action = req.getParameter("action");
        //判断action 来区分是哪种操作
        if("list".equals(action)){
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");

            User condition = new User(name,pass);
            //接收当前页参数 没传是null
            String currentPage = req.getParameter("currentPage");
            if(currentPage == null){
                currentPage = "1";
            }
            int int_currentPage = Integer.parseInt(currentPage);

            //创建分页对象
            Page page=new Page();
            page.setCurrentPage(int_currentPage);
            //查询用户表的记录总数
            int count = userService.count(condition);
            page.setTotalCount(count);
            page.setTotalPage();

            //计算偏移量
            int pageSize = page.getPageSize();
            int offset = (int_currentPage - 1) * pageSize;




            List<User> users = userService.findAll(condition,offset,pageSize);
            // 把数据放到请求域中
            req.setAttribute("users", users);
            req.setAttribute("condition", condition);
            req.setAttribute("page",page);
            //在哪个页面显示
            req.getRequestDispatcher("/list.jsp").forward(req, resp);
        } else if (("delete".equals(action))) {
            // 获取参数
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.deleteUserById(id);
            if (result > 0) {
                // 重定向
                resp.sendRedirect("user?action=list");
            } else {
            }
        }


            else if (("add".equals(action))){
                String name = req.getParameter("name");
                String pass = req.getParameter("pass");

                int result = userService.addUser(new User(name,pass));
                if (result > 0) {
                    // 重定向
                    resp.sendRedirect("user?action=list");
                } else {

                }
            }


            else if (("toupdate".equals(action))){
                // 获取参数
                String sid = req.getParameter("id");
                int id = Integer.parseInt(sid);

                User user = userService.findUserById(id);
                // 把数据放到请求域中
                req.setAttribute("user", user);
                //在哪个页面显示
                req.getRequestDispatcher("/updateUser.jsp").forward(req, resp);
            }


            else if (("update".equals(action))){
                String sid = req.getParameter("id");
                int id = Integer.parseInt(sid);

                String name = req.getParameter("name");
                String pass = req.getParameter("pass");

                int result = userService.updateUser(new User(id,name,pass));
                if (result > 0) {
                    // 重定向
                    resp.sendRedirect("user?action=list");
                } else {

            }
        }

    }
}
